WO2005034433A1 - Systeme de commande d'acces dans un systeme de reseau local radio (lan) - Google Patents

Systeme de commande d'acces dans un systeme de reseau local radio (lan) Download PDF

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Publication number
WO2005034433A1
WO2005034433A1 PCT/JP2003/012699 JP0312699W WO2005034433A1 WO 2005034433 A1 WO2005034433 A1 WO 2005034433A1 JP 0312699 W JP0312699 W JP 0312699W WO 2005034433 A1 WO2005034433 A1 WO 2005034433A1
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WO
WIPO (PCT)
Prior art keywords
carrier frequency
access point
priority
data transmission
data
Prior art date
Application number
PCT/JP2003/012699
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English (en)
Japanese (ja)
Inventor
Motohiro Uchiyama
Takahide Maeda
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to US10/567,703 priority Critical patent/US8289938B2/en
Priority to PCT/JP2003/012699 priority patent/WO2005034433A1/fr
Priority to JP2005509314A priority patent/JP4202362B2/ja
Publication of WO2005034433A1 publication Critical patent/WO2005034433A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0808—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA
    • H04W74/0816—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using carrier sensing, e.g. as in CSMA carrier sensing with collision avoidance

Definitions

  • the present invention relates to an access control system in a wireless LAN system, and more particularly to an access control system that controls access according to priority.
  • Standardization work for LAN is recommended by the IEEE (Institute of Electrical and Electronics Engineers) 802 Committee, and the IEEE802.11 Subcommittee discusses wireless LAN systems. Is being promoted.
  • the carrier layer sensing multiple access / collision avoidance method (CSMA / CA + Ack: Carrier Sense Multiple) is defined as the MAC layer protocol standardized by IEEE802. Access with Coll i sion Avoidance + Acknowledge ) force s adopted by Ru.
  • this carrier sensing multiple access / collision avoidance method communication is started after the client terminal that wants to communicate confirms whether or not the carrier wave has already been detected by another client terminal by detecting the carrier wave. .
  • FIG. 1 is a time chart showing how communication is performed in accordance with the carrier sensing multiple access Z collision avoidance method.
  • the plurality of client terminals CL1 to CL3 communicate via the access point AP.
  • the other client terminals CL2 and CL3 sense the presence of a carrier wave during communication with the client terminal CL1, so that data transmission is performed. Can not do.
  • a plurality of client terminals CL 1 to CL (3) If the distance between each other is such that the radio waves transmitted by other client terminals C cannot be sensed, multiple client terminals CL determine that data transmission is possible and perform data transmission, causing a collision. There is fear.
  • Fig. 2 is a time chart showing how communication is performed according to the bandwidth reservation request method (RTS / CTS: request to send / clear to send).
  • RTS bandwidth reservation request
  • CTS transmission confirmation
  • the CTS frame describes the MAC address of the client terminal CL that grants the transmission right to the destination MAC address area, and the time (Duration) required for data transmission / Ack frame reply is described. I have. Since the radio waves can be received by all the client terminals CL within the reach of the access point AP, the CTS frame is received by all the client terminals CL.
  • the client terminal CL having no transmission right stops the transmission operation for the time described in the CTS frame. In this way, it is possible to avoid collisions caused by radio waves transmitted by a plurality of client terminals CL.
  • Patent Document 1 An example in which a plurality of wavelength bands are used has been proposed (Patent Document 1>.
  • the technology described in Patent Document 1 corresponds to a plurality of client terminals).
  • Different communication bands are allocated to each station (terminal). The feature is that when a communication request is sent from one terminal to another terminal that is already communicating, the control station places the communication request in a queue, and when the previous communication ends, the queue is placed in a queue. In this order, communication is possible.
  • Patent Document 1 is different from the technique based on the carrier sensing multiple access / collision avoidance (CSMA / CA) scheme that controls access by sensing the presence of a carrier.
  • CSMA / CA carrier sensing multiple access / collision avoidance
  • An object of the present invention is to provide a system that employs a carrier sensing multiplex access / collision avoidance (C-SMAZCA) system in consideration of the above-described disadvantages and the prior art, and transmits a plurality of clients according to priority.
  • the present invention relates to an access control system that controls access according to priorities using multiple wavelengths in a wireless LAN system that can secure rights.
  • an access control system that achieves the above object includes, in a wireless LAN system in which an access point controls access from a plurality of client terminals, an access point and a plurality of clients.
  • Each of the terminals has a transmitting means based on a carrier frequency for data transmission and a carrier frequency for transmitting a control signal, and each of the plurality of client terminals has a memory storing priority information.
  • the carrier frequency for transmission is not detected, the data is transmitted to the access point using the carrier frequency for data transmission, and when the carrier frequency for data transmission is detected on the wireless LAN, the data is stored in the memory.
  • the access point has a memory for storing a priority control table for registering priority information included in a bandwidth reservation request sent from the client terminal, and And transmitting a transmission acknowledgment to the client terminal corresponding to the priority order of the priority information registered in the priority control table stored in the memory.
  • each priority of the priority information corresponds to an application that has generated a transmission request. It is characterized by being defined.
  • the access control system that achieves the above object, according to a fourth aspect, is characterized in that, in the second aspect, the priority control table for registering priority information includes, for each piece of priority information, a registration time, Client specific information and priority are registered.
  • the access control system according to the present invention that achieves the above object is as described in the fourth aspect, wherein there are a plurality of client terminals having the same priority of the priority information registered in the priority control table. Transmits the transmission confirmation to the corresponding client terminal in the order of the time registered in the priority control table.
  • Fig. 1 is a time chart showing how communication is performed according to the carrier sensing multiple access Z collision avoidance method.
  • Fig. 2 is a time chart showing how communication is performed according to the bandwidth reservation request method (RTS / CTS: request to send / clear to send).
  • RTS / CTS bandwidth reservation request method
  • FIG. 3 is a block diagram showing a configuration example of a client terminal C applied to the access control system of the present invention.
  • FIG. 4 is a diagram showing an operation flow of the client terminal in FIG.
  • FIG. 5 is a diagram showing a data transmission format used for data communication according to IEEEE802.il.
  • FIG. 6 is an explanatory diagram when the data transmission format is an RTS frame according to the present invention.
  • FIG. 7 is an explanatory diagram when the data transmission format is a CTS frame according to the present invention.
  • FIG. 8 is an explanatory diagram in the case where the data transmission format is a CTS frame according to the present invention. .
  • FIG. 9 is a view for explaining the priority information written in the frame body (8) area.
  • FIG. 10 is a diagram showing a configuration of an access point AP applied to the access control system of the present invention.
  • FIG. 11 is a diagram showing an operation flow of the access point AP corresponding to the configuration of FIG.
  • FIG. 12 shows an example of the contents of the priority control table 13.
  • FIG. 13 is a diagram showing an example of a time chart when data transmission is congested. DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
  • FIG. 3 is a block diagram showing a configuration example of the client terminal C applied to the access control system of the present invention
  • FIG. 4 is a diagram showing an operation flow of the client terminal CL of FIG.
  • the client terminal CL has a data network card 1 and a control network card 2, and has a function of transmitting and receiving data and control signals at different carrier frequencies.
  • IEEE802.11b In the standard according to IEEE802.11b, four wavelength bands can be used at the same time, so that two wavelengths can be used as carriers for data communication and control signals, respectively.
  • the priority information 31 corresponding to the type of the application 4 is stored in the memory 3 of the client terminal CL.
  • the CPU 5 detects the wavelength carrier for data communication in the data network interface card 1. It is determined (step S2).
  • step S6 When the wavelength carrier for data communication is not detected (step S2, No), it is determined that data transmission is not being performed in another client terminal CL because the band is empty. Therefore, data can be transmitted to the access point AP using the wavelength carrier for data communication (step S6).
  • the data transmission format used for data communication is as shown in FIG. 5 and conforms to IEEE802.11.
  • the data transmission format has areas of preamble I, PLCP (Physical Layer Convergence Protocol) header, MAC data m, and cyclic check code (CRC) IV (FIG. 5A).
  • PLCP Physical Layer Convergence Protocol
  • MAC data m MAC data m
  • CRC cyclic check code
  • the area of the MAC data ⁇ further includes frame control (1), duration identification (2), multiple addresses (3), (4), (5), (7), and sequence control. It has a MAC header that includes the area of (6), a frame body (8), and an area of the cyclic check code (9) that follows.
  • the destination address of data and the source address are registered. Further, the area of the frame control (1) has a configuration shown in FIG. 5C, and the type of the frame is defined by the type (10) and the subtype (11).
  • the type (10> and the subtype (11) are composed of 2 bits and 4 bits, as shown in Fig. 6, the type (10) and the subtype (11) are At this time, it means an RTS frame, and the MAC header has a duration (Duration), a source address RA and a destination address DA.
  • the type (10) and the subtype (11) are 0111010, it means that the frame is a CTS frame, and the MAC header includes a duration (Duration). It has the source address RA.
  • the frame is an ACK frame. It has a duration and a source address RA.
  • step S 2 when the wavelength carrier wave for data communication is sensed (step S 2, Y e S), wavelength carrier wave for data communication is in use.
  • a bandwidth reservation request is transmitted to the access point AP as an RTS frame using a control signal wavelength carrier different from the data communication wavelength carrier.
  • step S3 when a bandwidth reservation request is made, reference is made to the priority definition information 31 of the memory 3 (step S3), and priority information corresponding to the application which has issued the transmission request is searched, and the frame body following the MAC header is searched. Write to area (8).
  • FIG. 9 is a diagram illustrating the priority information written in the frame body (8) area.
  • the priority information is, for example, 1 octet, and information from a minimum priority of 00000000 to a maximum priority of 11111111 is written in the area of the frame body (8).
  • an RTS frame in which the type and the subtype are set to “010111” in the frame control unit is created by the CPU 5 and passed through the control network interface card 2. Then, it is sent to the access point AP by using the control signal wavelength carrier (step S4).
  • the access point AP sends a CTS frame having an address addressed to itself (as shown in FIG. 7, the area of the frame control type (10) and sub-type (11) is “00 1 1 0 0 ”)
  • the data 32 stored in the memory 3 is transmitted from the data network card 1 using step S5) and the wavelength carrier for data communication (step S6).
  • Step S7 Data transmission ends after receiving an ACK frame from the access point AP (the area of the type (10) and subtype (11) of the frame controller in Fig. 7C is "00111001") (Step S7).
  • FIG. 10 is a diagram showing a configuration of an access point AP, which has a network card 11 for data and a network card 12 for control similarly to the client terminal CL. It has the function of sending and receiving control signals.
  • FIG. 11 is a diagram showing an operation flow of the access point AP corresponding to the configuration of FIG.
  • the CPU 15 determines whether or not data is being transmitted (step S12). If not (step S12, o), the CTS frame is returned to the corresponding client CL (step S17).
  • step S12 If data is being transmitted / received (step S12, Yes), the priority information recorded in the area in the frame body (see Fig. 9: 8) is extracted from the RTS frame, and priority is given to the CPU 15 The degree information is registered in the priority control table 13 (step S13).
  • FIG. 12 shows an example of the contents of the priority control table 13. Registered stamp time I, MAC address ⁇ of client CL, and priority ⁇ are recorded.
  • step S14 When transmission / reception of the data currently being communicated is completed (step S14), the CPU 15 refers to the priority control table 13 (step S15). In this reference, the client CL having the highest priority is searched (step S16).
  • step S17 the CTS frame is returned to the searched client CL (step S17).
  • the client CL capable of communication is specified, data is received (step S18), and then data reception is terminated (step S19).
  • step S17 when returning the CTS frame to the corresponding client terminal CL, the corresponding priority information is deleted from the priority control table 13.
  • the priority control table 13 As a result, after the data reception is completed, communication with the client terminal CL that has transmitted the next highest priority information becomes possible.
  • searching for priority information by referring to the priority control table 13, if clients having the same priority are registered, for example, the priority control table 13 shown in FIG. It is possible to return CTS frames in ascending order of the registration stamp time I in the contents.
  • FIG. 13 is a diagram illustrating an example of a time chart when the data transmission is congested immediately when the client is already communicating in the above embodiment.
  • the client CL 1 while the client CL 1 is communicating, if there is a bandwidth reservation request from each of the clients CL 2, CL 3, and CL 4, the RTS signal is sent to the access point AP using the control wavelength carrier. .
  • the priority information written in the RTS signals from the clients CL2, CL3, and CL4 is in the order of CL4> CL3> CL2. Therefore, when the communication of the client CL 1 ends, the CTS signal is sent to the client CL 4 having the highest priority, and the communication right is given.
  • the client CL 4 to which the communication right is given can transmit data using the wavelength carrier for data communication.
  • the priority control in the wireless LAN system can be realized as described in the above embodiments by the present invention. Therefore, according to the present invention, it is possible to provide an access control system using a plurality of wavelengths in a wireless LAN system in which a transmission right can be secured between a plurality of clients according to the priority.

Abstract

La présente invention concerne un système de commande d'accès utilisant une pluralité de longueurs d'onde dans un système de réseau local radio (LAN) dans lequel un droit d'émission peut être obtenu en fonction d'une priorité fixée parmi une pluralité de clients. Dans ce système local radio dans lequel un point d'accès est utilisé pour commander des accès à partir d'une pluralité de terminaux de clients, le point d'accès et les terminaux de client possèdent chacun un organe d'émission utilisant une fréquence porteuse d'émission de données et une fréquence porteuse d'émission de signal de commande et, par ailleurs, chaque terminal de client possède une mémoire dans laquelle des informations relatives à une priorité ont été stockées. En l'absence de détection de fréquence porteuse d'émission de données sur le réseau local radio, chaque terminal client utilise la fréquence porteuse d'émission de données pour émettre des données au point d'accès. Lors de la détection de la fréquence porteuse d'émission de données sur le réseau local radio, chaque terminal client ajoute les informations de priorité stockées dans sa mémoire à la fréquence porteuse d'émission de signal de commande, utilisant cette fréquence pour envoyer une demande de réservation de bande au point d'accès. Puis, après réception d'une permission d'émission délivrée par le point d'accès en réponse à la demande de réservation de bande, le terminal client utilise cette fréquence porteuse d'émission de données pour transmettre des données au point d'accès.
PCT/JP2003/012699 2003-10-03 2003-10-03 Systeme de commande d'acces dans un systeme de reseau local radio (lan) WO2005034433A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US10/567,703 US8289938B2 (en) 2003-10-03 2003-10-03 Access control system in wireless LAN system
PCT/JP2003/012699 WO2005034433A1 (fr) 2003-10-03 2003-10-03 Systeme de commande d'acces dans un systeme de reseau local radio (lan)
JP2005509314A JP4202362B2 (ja) 2003-10-03 2003-10-03 無線ｌａｎシステムにおけるアクセス制御システム

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Application Number Priority Date Filing Date Title
PCT/JP2003/012699 WO2005034433A1 (fr) 2003-10-03 2003-10-03 Systeme de commande d'acces dans un systeme de reseau local radio (lan)

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